question_answer

Oxidation number of sulphur in Caros acid is

A) +6                                          

B) +4                          

C)  +8                         

D)         +7

Correct Answer: A

Solution :

Caros acid is \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{5}}}\text{.}\]It has a peroxide linkage, so, oxidation of S is calculated as Let the oxidation state of S is \[x.\] \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{5}}}\] (one peroxide bond) \[+2+x+3(-2)+1(-2)=0\] \[2+x-6-2=0\] \[x-6=0\] \[x=+\,6\]